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BiologyHose's langur is a diurnal species with a primarily folivorous diet, equipped with a specialised sacculated stomach and enlarged salivary glands to assist in the breakdown of tough leaf material. However, the species will also feed on fruits, seeds and flowers, as well as on the eggs and nestlings of birds such as the gray-throated babbler (Stachyris nigriceps) (3). In Sabah and Brunei, group sizes tend to range from six to eight individuals, although 12 or more have reported from Temburong and solitary individuals do occur (3) (7). Groups contain one adult male and two or more adult females, and mating is polygynous (3) (7). Hose's langurs give birth to single offspring (3), which are weaned by one year and fully mature by four to five (5), with males dispersing from their natal groups (7).